update TOC

README.md

@@ -5,15 +5,18 @@
 - [Description](#description)
 - [Prerequisites](#prerequisites)
 - [Installation](#installation)
-        - [Upgrading](#upgrading)
-        - [Uninstalling](#uninstalling)
-        - [Building](#building)
+    - [Upgrading](#upgrading)
+    - [Uninstalling](#uninstalling)
+    - [Building](#building)
 - [Tips](#tips)
-        - [Downloaders](#downloaders)
-        - [Scripting](#scripting)
+    - [Downloaders](#downloaders)
+	- [Windows](#windows)
+	- [Linux, Mac OS X &c.](#linux-mac-os-x-&c)
+	- [All platforms](#all-platforms)
+    - [Scripting](#scripting)
 - [Troubleshooting](#troubleshooting)
-        - [Reporting Issues](#reporting-issues)
-        - [Support](#support)
+    - [Reporting Issues](#reporting-issues)
+    - [Support](#support)
 - [Version](#version)
 - [License](#license)